/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.module.service;
import static java.lang.String.format;
import static org.reflections.ReflectionUtils.getAllFields;
import static org.reflections.ReflectionUtils.withAnnotation;
import org.mule.runtime.api.service.Service;
import org.mule.runtime.api.service.ServiceDefinition;
import org.mule.runtime.api.service.ServiceProvider;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.stream.Collectors;
import javax.inject.Inject;
/**
* Implements {@link ServiceProviderResolutionHelper} using reflection.
*/
public class ReflectionServiceProviderResolutionHelper implements ServiceProviderResolutionHelper {
@Override
public void injectInstance(ServiceProvider serviceProvider, Collection<ServiceDefinition> resolvedServices)
throws ServiceResolutionError {
for (Field field : getAllFields(serviceProvider.getClass(), withAnnotation(Inject.class))) {
Class<?> dependencyType = field.getType();
final Object dependency = lookupService(resolvedServices, dependencyType);
if (dependency == null) {
throw new ServiceResolutionError(format("Cannot find a service to inject into field '%s' of service provider '%s'",
field.getName(), serviceProvider.getClass().getName()));
}
try {
field.setAccessible(true);
field.set(serviceProvider, dependency);
} catch (Exception e) {
throw new ServiceResolutionError(format("Could not inject dependency on field %s of type %s", field.getName(),
dependencyType.getClass().getName()),
e);
}
}
}
private Object lookupService(Collection<ServiceDefinition> muleServices, Class<?> dependencyType) {
for (ServiceDefinition muleService : muleServices) {
if (muleService.getServiceClass().equals(dependencyType)) {
return muleService.getService();
}
}
return null;
}
@Override
public List<Class<? extends Service>> findServiceDependencies(ServiceProvider serviceProvider) {
final List<Class<? extends Service>> result = getAllFields(serviceProvider.getClass(), withAnnotation(Inject.class)).stream()
.map(f -> (Class<? extends Service>) f.getType()).collect(Collectors.toCollection(LinkedList::new));
result.forEach(clazz -> {
if (!Service.class.isAssignableFrom(clazz)) {
throw new IllegalArgumentException("Service providers can depend on Service instances only, but found "
+ clazz.getName());
}
});
return result;
}
}